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Re: question about roots?
the bubbles are bursting and spraying the roots, which is why they are being discoloured with the nutrients even though they are barely touching the water. just keep and eye out for nute burn and you should be fine. not sure if your ppm level is right, i dont measure mine, i just know how much to give due to trial and error.
if you are worried that your bubble wand is not working as you want, just buy some new airstones, i actually find the cheapest smallest air stones work best for my setup rather than the 6" air stones.
roots can get ugly when using certain brand nutes, you can always do a rez change and drop the ppm. just look at these ugly roots, and this is from a perfectly healthy pair of plants in a dwc setup like yours
pics help, good luck with your grow.
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